Hi.

You can make it with custom CSS. This one should work:

.nk-main .kc_single_image img {
    margin-left: -100px;
    margin-right: -100px;
    width: calc(100% + 200px);
    max-width: calc(100% + 200px);
}
@media (max-width: 991px) {
    .nk-main .kc_single_image img {
        margin-left: -50px;
        margin-right: -50px;
        width: calc(100% + 100px);
        max-width: calc(100% + 100px);
    }
}